Conduction Cooled XMC with 8 Channel RS232/RS422/RS485 Programmable Serial Interface

  • Conduction cooled XMC module
  • 8 channels with programmable RS232 / RS422 / RS485 interfaces
  • High performance asynchronous serial interface (up to 10 Mbps)
  • Hardware handshake support available
  • Half-duplex mode available
  • 256 byte FIFO
  • P14 I/O or P16 I/O

Product status: Active

Operating Temperature Range -40 °C to +85 °C RoHS compliant

The TXMC375 is a conduction cooled Switched Mezzanine Card (XMC) compatible module offering 8 channels of high performance RS232/RS422/RS485 programmable asynchronous serial interface with P14 I/O (TXMC375-10R) or P16 I/O (TXMC375-20R).

The serial channels can be individually programmed to operate as RS232, RS422 or RS485 full duplex/half duplex interface. In addition programmable termination is provided for the RS422/RS485 interfaces. After power-up all serial I/O lines are in a high impedance state.

Each RS232 channel supports RxD, TxD, RTS, CTS and GND. RS422 and RS485 full duplex supports a four wire interface (RX+, RX-, TX+, TX-) plus ground (GND). RS485 half duplex supports a two wire interface (DX+, DX-) plus ground (GND).

Each channel has 256 byte transmit and receive FIFOs to significantly reduce the overhead required to provide data to and get data from the transmitters and receivers. The FIFO trigger levels are programmable and the baud rate is individually programmable up to 1 Mbps for RS232 channels and 10 Mbps for RS422/RS485 channels. The UART offers readable FIFO levels.

All serial channels use ESD protected transceivers. ESD protection is up to ±15KV.

Software Support (TDRV002-SW-xx) for different operating systems is available.

Mechanical Interface Conduction Cooled Switched Mezzanine Card (XMC) Interface confirming to ANSI/VITA 42.0-2008 and ANSI/VITA 20-2001 (R2005);
Standard single-width (149mm x 74mm)
Electrical Interface x1 PCI Express (Base Specification 2.0 Gen 1) compliant interface conforming to ANSI/VITA 42.3-2006 (XMC PCI Express Protocol Layer Standard)
PCIe Target Chip XR17V358 (Exar)
Transceiver MAX3161E
IPMI Support per serial EEPROM, as defined in ANSI/VITA 42.0-2008
Interface Type Asynchronous serial interface
Number of Channels 8
Physical Interface Software selectable RS232, RS422, RS485 full duplex, RS485 half duplex
Serial Channel I/O Signals RS232: TxD, RxD, RTS, CTS, GND
RS422/RS485 Full Duplex: TxD+/-, RxD+/-, GND
RS485 Half Duplex: Dx+/-, GND
Termination Software selectable 120ohms
ESD Protection ±15kVHuman Body Model
Programmable Baud Rates RS232: up to 1 Mbps
RS422: up to 10 Mbps
I/O Interface TXMC375-10R: PMC P14 I/O (64 pin Mezzanine Connector)
TXMC375-20R: XMC P16 I/O (114 pin Mezzanine Connector)
Power Requirements VPWR is not used
Transceiver Shutdown: 70mA typical @ +3.3V DC (no load)
RS232: 80mA typical @ +3.3V DC no load; 130mA @3.3V DC Loopback
RS422: 150mA typical @ +3.3V DC no load; 330mA @ 3.3V DC Loopback
RS485 FD Master: 400mA typical @ +3.3V DC no load; 510mA @ 3.3V DC Loopback
RS485 HD: 150mA typical @ +3.3V DC no load; 390mA @ 3.3V DC Loopback
Loopback: Ch0 connected to CH1, CH2 connected to Ch 3…
Temperature Range Operating: -40 °C to +85 °C
Storage: -40 °C to +85 °C
MTBF 1 479 000 h
Weight 62 g
Humidity 5 – 95% non-condensing



8 Channel RS232/RS422/RS485 Programmable Serial Interface, P14 I/O

8 channels programmable RS232/RS422/RS485 serial interface; Programmable termination and full/half duplex mode; baud rates up to 10 Mbps for RS422/485 (1 Mbps for RS232); P14 Back I/O; Conduction Cooled


8 Channel RS232/RS422/RS485 Programmable Serial Interface, P16 I/O

8 channels programmable RS232/RS422/RS485 serial interface; Programmable termination and full/half duplex mode; baud rates up to 10 Mbps for RS422/485 (1 Mbps for RS232); P16 Back I/O; Conduction Cooled


Device Driver for Multiple Channel Serial Interface Family

Data Sheet

Data Sheet

Data Sheet - Issue 1.0.2

User Manual

User Manual - Issue 1.0.5